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import re
import typing
from .utils import get_args, get_kwargs
def parse_attributes(attrs: str, output_dict: typing.Dict) -> None:
"""Update a dictionary with name/value attributes from the attrs string.
The attrs string is a comma separated list of values and keyword name=value
pairs. Values must precede keywords and are named '1','2'... The entire
attributes list is named '0'. If keywords are specified string values must
be quoted. Examples:
attrs: ''
output_dict: {}
attrs: 'hello,world'
output_dict: {'2': 'world', '0': 'hello,world', '1': 'hello'}
attrs: '"hello", planet="earth"'
output_dict: {'planet': 'earth', '0': '"hello", planet="earth"', '1': 'hello'}
"""
if not attrs:
return
output_dict['0'] = attrs
# Replace line separators with spaces so line spanning works.
s = re.sub(r'\s', ' ', attrs)
d = {}
try:
d.update(get_args(s))
d.update(get_kwargs(s))
for v in list(d.values()):
if not (isinstance(v, str)
or isinstance(v, int) or isinstance(v, float) or v is None):
raise Exception
except Exception:
s = s.replace('"', '\\"')
s = s.split(',')
s = ['"' + x.strip() + '"' for x in s]
s = ','.join(s)
try:
d = {}
d.update(get_args(s))
d.update(get_kwargs(s))
except Exception:
return # If there's a syntax error leave with {0}=attrs.
for k in list(d.keys()): # Drop any empty positional arguments.
if d[k] == '':
del d[k]
output_dict.update(d)
assert len(d) > 0
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